如何关闭导航控制器？

Question

我正在展示一个带有 showDetailViewController() 的导航控制器（detailview）。我想在按下按钮时将其关闭。如何关闭此视图控制器？

我尝试过的代码：

//detailviewcontroller
    @objc
    func cancel(_ sender: Any) {
        print("cancelPressed")
        //self.navigationController?.popViewController(animated: true)
        //self.navigationController?.dismiss(animated: true, completion: nil)
        //self.dismiss(animated: true, completion: nil)
        //splitViewController?.dismiss(animated: true, completion: nil)
        //splitViewController?.navigationController?.popToRootViewController(animated: true)
        //splitViewController?.navigationController?.popViewController(animated: true)
        //splitViewController?.navigationController?.dismiss(animated: true, completion: nil)
        //navigationController?.popViewController(animated: true)
        //navigationController?.dismiss(animated: true, completion: nil)
        //self.navigationController?.popToRootViewController(animated: true)
        //self.navigationController?.viewControllers.remove(at: 1)
        //self.navigationController?.viewControllers.remove(at: 0) - this one removes to blank view
        //self.presentingViewController?.dismiss(animated: true, completion: nil)
    }

我已经尝试了多种 stackoverflow 解决方案：

Dismissing a navigation view controller

How to dismiss a view controller in a navigation controller, without dismissing the whole stack

ios swift - dismiss root view controller of navigation controller

Can't dismiss View Controller that's embedded in a Navigation Controller

How to dismiss a navigation controller presented from another navigation controller in iOS 10 and below?

Can't dismiss navigation controller in Swift

Can't dismiss navigation controller in Swift

Dismissing View Controller Doesn't Work While Using Navigation Controller

Dismiss current navigation controller when clicked tab bar

How to dismiss a certain view controller

我如何展示 detailviewcontroller：

//masterviewcontroller
// delegation for passing data between controllers
weak var passDelegate: PlaceSelectionDelegate?

func insertNewObject(_ sender: Any) {
    if let detailViewController = passDelegate as? DetailViewController {
        if let detailNavigationController = detailViewController.navigationController {
            detailViewController.delegate = self
            splitViewController?.showDetailViewController(detailNavigationController, sender: nil)
        }
    }
}

预期结果： 按下按钮时关闭详细视图控制器。

实际结果： 没有解雇。

Answer 1

好的，我一直在寻找一种方法来处理这个showDetailViewController，虽然我不确定这是否能回答你的问题，但我就是这样做的：

我有两个控制器，我们称之为FirstController 和SecondController。它们都继承自UIViewController。当我单击FirstController 中的某个导航栏按钮时，我使用showDetailViewController 将SecondController 显示为向上移动的工作表，就像日历应用程序中的“日历”按钮一样。

在FirstController 中，我实现了两个功能：一个显示SecondController，另一个关闭它。我在 SecondController 中调用了解除操作。它看起来像这样：

// FirstController
@objc func showSecondView() {
    let vc = SecondController()
    vc.delegate = self          
    let nav = UINavigationController(rootViewController:vc)            
    self.showDetailViewController(nav, sender: self)
}

func closeSecondView() {
    self.dismiss(animated: true)
}

如您所见，我将SecondController 包裹在UINavigationController 中，因此它显示了带有标题和所有内容的导航栏。代码是这样的：

// SecondController
weak var delegate: FirstController!

override func viewDidLoad() {
    super.viewDidLoad()
    title = "Second"
    navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .done, target: self, action: #selector(closeMe))
}

@objc func closeMe() {
    delegate.closeSecondView()
}

注意我是如何为FirstController 创建一个属性的，然后我用它来关闭SecondController。当我提出SecondController 时，我将self 指定为委托，这意味着我现在可以从其中调用closeSecondView 方法。

我不确定它是否适用于拆分视图。文档似乎建议无论何时使用它，如果屏幕足够大，它的行为就会有所不同，因为UISplitViewController 会覆盖它。它还说所有视图控制器都有这个方法。

看一看：https://developer.apple.com/documentation/uikit/uiviewcontroller/1621432-showdetailviewcontroller

试一试，希望对你有帮助。

Answer 2

如果您只是想关闭导航控制器，这应该可以工作

navigationController?.dismiss(animated: true, completion: nil)